Last Star Trek Episode You Watched

I always wanted one of the later series to feature a Horta in some capacity. I remember hearing somewhere that there were plans for a Horta to be in the Federation Council scene in Star Trek IV but they couldn't pull it off.

"Is There in Truth No Beauty?" One of the best third-season episodes, and proof that Star Trek's positive vision of the future still had plenty of room for interesting, flawed, troubled characters . . . at least back in TOS.